Nuveen Investments
                              333 West Wacker Drive
                                Chicago, IL 60606

                                November __, 2002

[           ]
Managing Director, Equity Capital Markets
Salomon Smith Barney Inc.
388 Greenwich Street
New York, NY 10013

Dear [       ]:

               Reference is made to Nuveen Insured Tax-Free Advantage Municipal
Fund. The fund currently is making an initial public offering of its common
shares of beneficial interest (the "Shares") through several underwriters. Such
offering is referred to herein as the "Offering". You are acting as lead manager
and representative (the "Representative") of the underwriters of the Offering
and we are participating as a manager and underwriter of the Offering.

               We are requesting that we be able to offer certain broker-dealers
the opportunity to participate as selling dealers in the Offering. This letter
is to confirm our agreement with you as to the terms and conditions on which we
may transact business (collectively, the "Nuveen Selected Dealers" and,
individually, a "Nuveen Selected Dealer"):

          a.   each Nuveen Selected Dealer to whom we offer to sell, or sell,
Shares shall have entered into a master selected dealer agreement ("Selected
Dealer Agreement") with Nuveen, the form of which is attached hereto as Exhibit
A;

          b.   before offering to sell, or selling, Shares to a Nuveen Selected
Dealer, Nuveen will carry out such independent investigations as it deems
necessary to determine that such dealer satisfies the criteria set forth in
Section 6 of the Selected Dealer Agreement;

          c.   we will act under and enforce each Selected Dealer Agreement only
with your consent (which shall not be unreasonably withheld) or upon your
instruction;

          d.   we shall not allow to any Nuveen Selected Dealer purchasing
Shares in an Offering a selling concession that is in an amount in excess of the
maximum selling concession set by you for selected dealers for the Offering; and

          e.   we agree upon instruction from you, subject to the other terms of
the Offering, to pay for and purchase all Shares that we reserve in the
Offering, whether such Shares are reserved by us for our own account or for the
account of one or more Nuveen Selected Dealers, and we agree to make all
purchases of Shares in accordance with Master Agreement among Underwriters dated
July 1, 1999 between the Representatives and Nuveen and the underwriting
agreement for the Offering of such Shares.



                                                                               2

               If the foregoing correctly sets forth our understanding regarding
the matters described herein, please so indicate by signing a copy of this
letter where indicated below and returning the signed copy of this letter to us.
For your convenience, a duplicate copy of this letter has been included.

                                             NUVEEN INVESTMENTS

                                             By
                                                ---------------------------
                                                Name:
                                                Title:



                                                                               3

Acknowledged and agreed to as of this
__ day of November, 2002 on behalf of themselves
and, in respect of the Offering, the other
underwriters of the Offering.

by: SALOMON SMITH BARNEY INC.

SALOMON SMITH BARNEY INC.,
as Representative of the Underwriters

By
     ----------------------------------
     Name:
     Title: